8-437 BLACK BUNA 90D BACK-UP RING

Part number HB90437 is an AS568-437 black Buna-N (Nitrile) 90 Shore A Back-Up Ring supplied with an inside diameter of 5.975 in (151.77 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.525 in (165.74 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

Buna-N (Nitrile) is specified here for reliable performance in both static and dynamic service, strong abrasion and tear resistance. Expect good resistance to greases and lubricants, many alcohols, and water. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to polar solvents or strong acids will shorten service life.

Typical settings include construction equipment, hydraulic and pneumatic systems, and general industrial maintenance.

Reference part number HB90437 when ordering; the item is sold individually. Unit weight is approximately 10.858 g and nominal inside diameter is listed as 6 inch. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.